题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040350-33996.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040350-39215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040351-25982.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040351-53491.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040351-32901.png)
解析
试题分析:根据题意,由于
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040350-39215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040351-11565.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040352-12235.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040352-60340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040352-94581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040352-21081.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040351-32901.png)
点评:主要是考查了等比数列和余弦定理的运用。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040344-49889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040344-72660.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040344-11566.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040344-17144.png)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040345-64925.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040345-26696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040345-28930.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040339-39583.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040339-92933.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040339-93426.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040334-49967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040334-53542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040334-67910.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040330-33089.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040330-68060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040330-33089.png)
A.锐角三角形 | B.钝角三角形 | C.等腰三角形 | D.等边三角形 |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040326-13998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040326-78420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040326-62952.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040326-71633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040326-62280.png)
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